Hitman missions require specific weapons for specific assignments, so while it's good to start all 3 early so you know where all the people are, it's something you'll actually complete as you go through the rest of the game. There's no "order" to the kills - you get a list of names, weapons, and locations - and then just handle them as you want to.

The list is of course different for each client.

You can put a person into your HUD to help you find them. You're told immediately when you kill the right person, and get the respect / money immediately. I.e. you don't have to return to the client. Note, bizarrely, that there are often "multiple of them" when you go to an area and you just have to kill one of them. Are these clones?

Also note that you can put people in your HUD at any time - you don't have to return to the client's location. Just go into your menu and choose hitman from activities. You can see all the names, photos and weapons right there and put someone into your HUD. You don't need them in your HUD to kill them, though. Still, if you don't have your HUD area used for anything while you're roaming around, stick a random hitman target into it. You never know.

Los Carnales
At the Airport Hotel

Name

Weapon

Location

$ Paid

Respect

Julia

Vice 9

barrio

$100

700

Thomas

Baseball bat

docks

$200

800

Gabriel

Tombstone

factories

$500

900

Chris

SKR7 Spree

airport - mailman

$1,000

$1,000

Theresa

Knife

barrio - daytime

$1,500

1200

Tina

GDHC .50

barrio - skater

$2,000

1200

Bill

Molotov Cocktail

factories

$3,000

1300

John

McManus

FBI sniper - in helicopter - have to hit police level 5

$5,000

1400

When you finish this set, you get a new gold 50 15 mag / 115 available at your crib.

Westside Rollerz

Name

Weapon

Location

$ Paid

Respect

Jackie

Vice 9

docks in ambulance

$100

700

Alan

Knife

SE of arena dome

$250

800

Jose

T3K Urban

truck yard - easy, lots of him

$500

900

Charles

Nightstick

suburbs, downtown too

$1,000

1000

Roxanne

NR4

apartments, rainy am

$1,500

1100

Juan

Tombstone

apartments - Chinatown on edge, daytime

$2,000

1200

Bucky

Grenade

arena - hot dog guy

$3,000

1400

Bill

K6 Krukov

FBI guy - have to hit police level 5

$3,000

1400

When you finish this set, you get a new platinum shotgun AS12 15 mag / 115 available at your crib.

Vice Kings

Name

Weapon

Location

$ Paid

Respect

Dick

Knife

downtown

$100

700

Marty

Baseball bat

suburbs

$250

800

Richard

.44 Shepherd

high end retail - daytime, often in vehicle

$500

900

Henry

T3K Urban

downtown

$1,000

1000

Billy Bob

12 Gauge

downtown - on long road

$1,500

1100

Don

.44 Shepherd

red light - in vehicle, only briefly each night

$2,000

1200

Hank

Molotov Cocktail

museum

$3,000

1300

Louise

RPG Launcher

high end retail - daytime. Use HUD, there are many similar people

$5,000

1400

When you finish this set, you get a new SMG - platinum T3K 65 mag / 350 available at your crib.

When all 3 are done, you get a platinum RPG - 1 mag / 21 at your crib.

If you're pulling a target out of the vehicle, make sure you have the proper weapon equipped before you do. Sometimes carjacking causes an auto-shoot.